Seems like it's for the questline "The best memory" : at some point there's a quest requiring to gather 10 of them. I don't know why we can find them before accepting the quest though (I'm personally not at this step, but I've already found some too).
Edit : It's maybe so everyone can get the baskets, which isn't a bad idea. But it would have been better if something was written in the announcement thread so it wouldn't be confusing. Actually, this new questline hasn't even been announced at all in the forum and isn't in .net wiki ...
Edit 2 : my bad, it was presented in the changelog 2.198 with other updates, but still without mentioning what were these baskets and how many we were supposed to get. Without any precision and with the quest appearing at half the questline, we could easily wonder if these questline could be a clicky one.