This happens every year about this time. Look for it to get worse over the next three weeks or so. Next time, consider asking for USPS delivery services.
The United States Postal Service:
Was over 100 years old when UPS was founded.
Was almost 200 years old when FEDEX was founded.
Still delivers more items EVERY DAY than UPS, FEDEX, and DHL combined deliver in a YEAR.
Will pick up your packages (and letter mail) AT YOUR DOOR, AT NO CHARGE.
Will hold/reschedule/forward delivery AT NO CHARGE.
I remember when UPS went on strike in '97. Your USPS picked up the slack without missing a beat. It was a crisis for UPS and customers. The minute (relatively) increase in package volume didn't even cause a blip in USPS statistics. The Processing & Distribution Center I worked at absorbed the increase without a minute of over-time.
I have bought and sold about $20,000 worth of used camera equipment over the last 8 years or so. If given a choice, I opt to have things shipped to me via USPS Priority Mail. When selling, I ALWAYS use USPS Priority Mail. I have actually gone from listing an item on POTN, to scheduling the pickup with USPS, in less than 30 minutes.
To add some tasty butter cream frosting to the delicious marble cake that is the USPS, I've never had an item lost or damaged by the USPS. Though sometimes their tracking system is wonky, and delivery is unexpectedly slow.
Full disclosure: I am a retired, 28 year veteran of the USPS.