Backlogged Mail

Household didn't get mail for almost a week. Then mail started showing up again. Went to the mail office to see what was up and the carrier supervisor told me they were short-staffed. Then I ran into my mailman who told me he was on vacation and they didn't have someone step in as a replacement while he was out.

I'm waiting for a mailer from Etsy with a necklace that has been tracked in my city since 4 days ago. Pitney Bowes showed an update of "in transit" in my city 4 days ago with no further updates.

I'm not familiar how the mail sorting system works. Is it possible that there's a giant backlog from when my mailman was out and they are still sorting through the backlog? Like there's a big pile that is getting whittled down? Trying to figure out if my item is likely lost or if it's still really "in transit" and I should chill for a few more days.