Constantly losing hats at daycare

Just to preface, we do label them with stickers AND sharpie his name on them and we’re not getting expensive hats. I’m just sick of buying more.

Our problem is that we’re losing a good 7-8 hats per year at daycare. I often see other kids with them, ask for them back, then later that week they just disappear and never make it back. I don’t see them at daycare again usually after we’ve lost them.

Is this normal? Does our daycare have a hat thief? If it is normal, why don’t we gain a hat or two each year too?