In a letter to Alberta's official opposition Wildrose Party, an official with the RCMP says officers did what they felt was necessary but "did not take operational direction from any elected officials or public service employees to enter in private homes"  (
link)
Read that last part again: The RCMP "did not take operational direction from any elected officials or public service employees to enter in private homes" 
That is quite the admission. The RCMP entered locked private homes 
without a warrant and 
seized personal property ( This is not about guns. The property seized, had it been computers or even vacuum cleaners, is irrelevant) on their own 
without direction from any elected official or public service employee.
Unfortunately for the RCMP the only law in Alberta that would allow them or anyone else to undertake such extraordinary actions is the Alberta Emergency Management Act (
AEMA  (read the entire act for yourself) and the act very clearly states 
that such actions must be authorized by someone who is an "elected official or public service employee."*
Powers of Minister in emergency:
19(1) On the making of the declaration and for the duration of the 
state of emergency, the Minister may do all acts and take all 
necessary proceedings including the following:
h)   
authorize the entry into any building or on any land, 
without warrant, by any person in the course of 
implementing an emergency plan or program;
c)   acquire or utilize any real or personal property considered 
necessary to prevent, combat or
 alleviate the effects of an 
emergency or disaster; 
 
It reads 'the Minister may authorize' something, not 'the Minister automatically does authorize'. There are no extraordinary powers given directly to the police anywhere in the act and in fact the word "police" is nowhere to be found in the act, and any such powers available to the police 
require that the Minister authorize their use. Without that authorization, there are no special powers. Also note that it says 'any person'. The Minister may authorize, the fire dept, the postman or even his crazy Uncle to do any of those things listed in sec 19 as he (they) deem necessary, it does not have to be the police and in fact there are very good reasons why the word 'police' was omitted from the AEMA and why they were 
not given any specific powers.
Note also that in the AEMA is the requirement for a paper trail which it seems the RCMP do not have.
Proof of authorization
  
If the Minister authorizes a person to carry out a power or duty 
of the Minister under this Act as the Minister responsible for this 
Act or as a local authority and the authorization
(a)   is made in writing,
(b)   purports to be signed by the Minister responsible for the 
Municipal Government Act
or the Minister responsible for 
the Special Areas Act, and
(c)   states that the person named in it is authorized under this 
section to carry out the power or duty set out in the 
written authorization, 
that written authorization or a copy of it shall be admitted in 
evidence as proof, in the absence 
of evidence to the contrary, of 
that person’s authorization to carry out the power or duty without 
proof of the signature or official character of the Minister. 
RSA 2000 cD-13 s3;2007 c12 s4;2010 c5 s2 
It is this simple. Warrantless entry and property seizures require written authorization and either that written authorization from someone who is allowed to do so exists or it does not exist. If it does, let's see it.
Somebody screwed up big here and while many want to blame the Redford government for this, it appears that the RCMP are responsible for the mess in High River and I suspect that it will not end well for somebody in the force. Heads will roll.
Not that the Redford government has much to be proud of on this file by having this happen under their watch and now by desperately trying to downplay the entire gun grab and divert attention away from themselves by claiming the opposition are playing politics and scare mongering. 
Redford's bizarre attempt in the face of facts to create an alternative reality and 
Minister Doug Griffiths use of the F-bomb yesterday show just how worried the PCs are about this issue and unfortunately also shows that they would rather continue play political games by downplaying the incident and dismiss the legitimate concerns of Albertans all to protect their own skins. There is little in their actions to date to be proud of and even though the RCMP look to be at fault here, the attempt by the PC's to make this political rather than worrying about possible breaches of law against the people of High River doesn't make them look any better than the RCMP here.
*The act reads "the Minister" but in the case of a local declaration of emergency as was the case in High River (the local state of emergency was declared in High River on June 19, 2013 at 7:04AM) the 'local authority' in this case the mayor and council have the same authority as the Minister with regards to authorizing the extraordinary powers listed in section 19.