My local (DEALER--NOT C#R) mails handguns for me with no problem. Otherwise, ANY other method virtually always busts over the 50-60 dollar level.
The affidavit stuff you are talking about (SEC 11.1.3) is NOT APPLICABLE to DEALER to DEALER shipments. The affivdavit requirement is for NON-DEALER transactions involinving some fairly specific circumstances. Likewise, ONE document usually doesn't constitute a "pile" (normally).
Feel free to read the regulation Chuck:
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11.1.5 Manufacturers and Dealers
Handguns may also be mailed between licensed manufacturers of firearms and licensed dealers of firearms in customary trade shipments, or for repairing or replacing parts.
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There is a short form that the postmaster can ask the dealer to fill out, but they never do this (at least in my experience over 20+ years and several states, and even if they did, it's no biggies compared to the BS dealers can go through at UPS and (to a lesser degree at FedEx) sometimes.
DMM 601 Mailability