Are old sweet tins valuable?

Are those vintage sweet tins from your childhood really worth anything, or are they just sentimental keepsakes? I've heard rumors that collectors are willing to pay top dollar for rare and unique items like these, but I'm not sure if that's just hearsay. Is there a way to determine the true value of these tins, and if so, what factors should I consider? Are there any specific brands or designs that are more sought after than others? I'm curious to know if there's a market for these kinds of items, and if so, how I can go about finding a buyer.