I guess tax-wise they have to have a record of sales... but is it necessary that names and addresses be recorded, that would be my question.
President Trump is going to leave office one day and eventually the Liberals will be in a position to pass a raft of anti-gun legislation, and these lowers will be on the list. Banning begets confiscation and business records are a logical starting point for the BATF&E to know where to start breaking in doors at 3AM, stomping cats and pushing pregnant women around before shooting their husbands.
The answer is "NO"
80% blanks are--legally--just hunks of steel and have nothing whatever to do with the gun industry.
Someone would have to be a fool to order the kits online and pay with their credit card.
Now, somebody who bought a few dozen, and sold them for cash at a gun show, might make a premium from allowing anonymous purchasing...