How the fuck did I get my pack today?? (Columbus day) 6 hours later than usual delivery

So I been checking MYUSPS for my kpack of bars from my usual vendor and it's been expecting date Tuesday for a few days now. I randomly checked MYUSPS again a bit ago and noticed my pack said delivered in/at box at 6:15pm. Also, instead of it hitting my local post office first then saying out for delivery as usual, it went straight from the sorting facility to 'Arrived at Hub' at 1:01pm, then 'Delivered, In/At Mailbox' at 6:15pm. Mon-Fri my mail always comes between 10am-12noon, Saturdays no later than 2:30pm. I go down and look and needless to say my pack is sitting in there with no other mail and it's 9pm Monday (Columbus day). I thought the PO's were all closed and shit. I've never had mail delivered even relatively that late, 6:15pm. In addition, it left the local sorting facility which is 1 hour and 15 minutes away from my drop at 3:01am and arrived at 'the hub' at 1:01pm, 10 hours later. Anything to worry about? Should I not open? Anyone else get mail today? (Checked with 3 other locals and they received no mail whatsoever.)