My invitations are lost in the mail - 64 days to go

So I’m 64 days out and getting really antsy about sending invitations. However, they seem to be lost in the mail. They were scheduled for delivery Monday, but dropped off my USPS informed, and haven’t reappeared since. I emailed USPS about it and they said it’s probably processing somewhere and flagged it to tell me as soon as they found it. It’s been 2 more days and nothing. I don’t think I can get them reprinted fast enough.