They don't confiscate things at the ranger station. They collect the balance of your camping fees, go through the do's and don'ts of being in the wilderness, collect some information about your route, etc., then send you on your way.
Do you have a permit and entry point yet?
Here is the link to
Quetico Rules & Regulations. You can also call the Quetico park office with questions: (807) 597-2735