I placed a single order with a larger well known vendor, and a few days later I checked on myUSPS for tracking. To my surprise, there were 3 tracking numbers for 3 parcels. At this point, these were just the numbers sent electronically to USPS indicating these parcels are going to be shipped to my address.
I contacted the vendor, informed them that there must some kind of confusion on their end, and supplied the tracking numbers. The reply was yes this was a mistake, there will be only one package sent to me, and thanks for letting us know.
I breathed a sigh of relief, because the prospect of 3 priority packages coming from the same address on the same day would have certainly looked fishy. And who knows what else was being sent, maybe something way outside my comfort zone.
So this is a kind of a double-edged sword. Usually vendors don't like giving out tracking for OPSEC reasons. But with a myUSPS account, you sometimes can get the tracking info anyway. And in this particular case, it may have saved both the vendor and myself from a big headache.
I realize vending must be hard work, people get tired and make mental errors. I just think it helps when the customer has some way to keep an eye on the shipping process to make sure it's going as it should, instead of waiting in the dark and hoping for the best....
Having 3 priority packages come from the same address on the same day doesn't look fishy. If you had 15 packs come from the same address to your place for months on end it'd be suspicious, but there's so many people addicted to (legal) ecommerce that the USPS doesn't give a shit if someone gets a lot of mail like that.