Look up the contract you signed when you consigned the items.Oh yeah, this happened to me too! Decided to consign a nearly new leather jacket to a local dress agency. I went back to collect it the day the agreement ran out and the owner told me she had “donated” all the old stock that morning. I was very angry but what could I do? She scammed me, I knew it, she knew it, but I couldn’t prove anything. When the shop closed down I did a little happy dance inside
The way it worked with the consignment store I did business with, the contract gave an end date (90 days? I believe) and after that date, you had 72 hours to retrieve any unsold items, after which they would be donated. In one case, I'd missed the 72-hour timeframe by a day or 2 but still found my unsold items and took them back without an issue.
I've never seen a consignment contract which allows them to donate on the same date as the end of the consignment period.