No good deed goes unpunished.

It looks like they have received different orders at customs in the last year or two as I had no issue when I brought in glasses and the last time I had about 75 of them. They x-rayed my bag and asked me to open it as the box with the glasses was in the middle and they were curious as to what it was but when I explained it was for donations, I had no issue. Same with my large hockey size duffle bag full of clothing and shoes I bring every year. I come in with usually 2 large duffle bags and a large suitcase and my laptop bag that is not small either and they will inspect but never been asked for paperwork or threatened with a fine.