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Have you been using the property continuously, exclusively, openly and without consent?
Is the Crown aware of the usage?
You would have to use this land for 10 years to be able to claim adverse possession rights.
And the land has to be used openly and exclusively as well as continuously.
It sounds like you are meeting these requirements.
There are no specific documents. Rather you have to prove the usage so take date photos and have witnesses who can attest to the fact that you had the cabin there that you have been using during the requisite years.