Wishing you all the best in your finals!!
I held back giving any reply as many have suggested ways already... I am not a Canadian but I very much know CBSA is undoubtedly strict and serious so coming clean with them asap would be best as Fedex just wouldn't want to get involved in these situations.....
I do think they "tried" to get it resolved at first stage by asking for an invoice but of course the "seller" would not issue one as it is clearly against the law especially when the case has caught attention already and they would not take an initiative to self-correct himself/ herself in the declaration (as the difference is too big and he/ she might get into trouble when, from your saying, he/ she should still have businesses with other resellers in Canada" )
So now the item goes to Customs and they have established the case as "under-declare" and a fine is certain.... You have supplied the original receipt and certificate so they should have done the reassessment on the actual value of the item already...
so the last thing you can do is to clearly explain the situation (hopefully through your lawyer who should make a proper statement with all evidences including bank wire receipts, your dialogues with the seller asking him/ her why he/ she under-declare in the first place)
If I were you, I would avoid claiming to be a student nor I didn't know about the duties as CBSA would argue 1. you are responsible and you should know as a Canadian with clear instructions and info online 2. you can afford a CAD$15,000 ( did I get it right?) bag as a student 3. it has been weeks and you have already missed and delayed the chances you had to self-correct or talk to CBSA the day you knew of the situation
So these are the things they would consider when they evaluate whether or not to exempt you..... personally I think your best defence would be that 1. it's not your initiative to under-declare it 2. you have been prepared to pay all the due duties as required from day one (evidence: you asked seller how much duty you needed to pay before he/ she shipped it off) 3. you have no idea how to calculate the value of a second-hand item and you put your trust in the seller and when he/ she said he/ she would "under-value" it, you didn't know "under-value" means she would mark it as a gift....
And some practical info:
http://www.cbsa-asfc.gc.ca/import/postal-postale/dispute-contestation-eng.html#_s1
Just what I would have done if I were you and I am
no expert... but I do hope you can get this sorted asap
I know how difficult it is to deal with all the parties in the situation and all the worries that come with it.... the worst case would be not having this bag but I am sure you will have many more to come in your future.... everyone has difficult situations in life at least once or twice.... I believe this forum is here for hermes lovers to support each other.... I would wish to see your reveal post in the near future ^^