with all due respect, let me reframe your question
"is it suspicious to track my mail?"
no, they provide this functionality for a reason (so people will use it)
with any carrier, the concern is frequently checking tracking using a device that is leaking your location in the event you encounter a domestic seizure and are being watched
however, and you may already know this, U5P$ *will* set off a flag in their systems if you check packages over t

r. i never figured out if it was immediate or there's a counter threshold but either way just don't do that.