Technically speaking- a conventional check can come in numerous forms.
If I remember correctly- all it has to include is a properly formatted routing-number, the "pay to the order of", a signature, the amount, and maybe a memo line for your Verizon account number.
I have had friends send bricks, bowling pins, and old shoes with this information included using a felt pen at various points in time. Each time it was accepted as legal tender.

"shipping charges may apply"

Well, depending on the make and model of the switch, the DS-3 interfaces could be rather spendy. We have 4 such Cisco 6500 series modules at my day-job. Together they cost upwards of $100K US 3 years ago.

Someone mentioned tracking by MAC address... an OC-3/DS3 is a channelized TDM line. 28 DS1 channels of serial data. This is below IP layer. The only identification is going to be a serial number. This will only matter if someone attempts to connect it with a service contract with the manufacturer.

Someone at least knew what to take. They could very well be one of the most expensive pieces of WAN hardware for their size and weight (often no larger than an average book).