The letter the BATFE (may) be sending you is nothing but smoke. If you had done something wrong you would not receive a letter...you would be handcuffed. If you were really straw buying, flipping guns the last thing the BATFE is going to do is send you a letter telling you to stop...that would be akin to the DEA sending letters to suspected drug dealers telling them to stop...or the FBI sending letters to suspected terrorists warning them to stop...does not make a lot of sense does it?
Lawyering up should be the end of it unless you have actually done something wrong. There should be no more incriminating questions and that includes phone calls, emails, and the letter you (may) receive should do nothing more than provide instructions for lawful compliance which does not violate miranda. I witnessed a Indiana State Police Detective get turned inside out in court once for being cute and trying to skirt miranda once it was invoked by telephoning the suspects. The judge made him look like a buffoon and the entire case was kicked! I can't help but suspect you may have gotten under the skin of the agent and he is just poking you a little to get you riled up. Did you happen to, perhaps, get under his/her skin a little also?
If you do happen to be dealing with a LEO who does not understand the law, which happens occasionally, then forward all subsequent contact to your attorney. If you do receive another phone call then advise the BATFE Agent the phone converstaion is being recorded if you live in a two party state. Federal law and a few states allow one party taped converstaions. The agent will probably advise you it is unlawful to record the conversation (if you are required to disclose the recording) but that is not true...it's just standard procedure to warn as such. The agent (or any smart LEO) will probably just hang up without questioning you further. Then make a copy of the recording and forward it to your lawyer after writing down the time and date and name of the LEO. Your attorney will know what to do at that point. And always remember...LEO's at all levels are allowed to lie as an investigative tool...they will try, and often do, fool people into knee-jerk reactions. If the ATF Agent you are dealing with reads this thread he will probably get a good laugh out of all the responses. Just for the record...the BATFE is contacting a good number of individuals in my area who purchase two or more hanguns in a 7 day period. Shotguns and rifles do not seem to trigger the visit.
The BATFE Agent is just doing his job and I know many on here will be up in arms over it. Try to remember BATFE Agents or any other form of LEO probably doesn't know you personally or your true character. And seeing as to how LEO's are continually lied to they begin not to trust anyone. After the first time you trust someone, get burned, and made a fool of, you learn not to trust and believe everything you are told. Yeah, LEO's can be rude and obstinate...but so can private citizens. Then the siege mentality sets in...both for the LEO's and private citizens.
Okay, let the flaming begin. I think I'm going to be outnumbered for defending the hated BATFE a little.