Female posing as a Male, I think.
Transgender Teen Arrested for Montgomery County School-Shooting Plot
https://www.nationalreview.com/news/transgender-teen-arrested-for-montgomery-county-school-shooting-plot/
MoCo Press Release...
I don't believe the DC "letter" has anything to do with legally defining a "collector" under MD statute. It is subject to interpretation (not necessarily by MSP, could be the Courts).
"boner fide" that Biggfoot mentioned below...
Depends on the configuration, and possibly purchase date.
Check the copycat provisions below.
https://legis.delaware.gov/json/BillDetail/GenerateHtmlDocument?legislationId=109607&legislationTypeId=1&docTypeId=2&legislationName=HB450