What should I do if I lose the receipt for public maintenance? The property said they didn't have a stub. What's the use of receipts for public maintenance fees?

That's what overhaul fund received, that is, you handed in the voucher of overhaul fund. The property does not have a stub for this because it was not issued by the property. If you really need it, you can try to check with the local housing authority. Generally speaking, it won't have much impact, but for the sake of insurance, you'd better check with the Housing Authority and make a statement in the newspaper.