Exactly my point.And there is no way to tell how many illegals were successful in their attempts, either. Regrettable, but necessary to the idea of not infringing. It’s a flaw, but an unfixable one, because that would necessitate keeping a database, which is a no-no, and we’d also be exposed to that sort of scrutiny. Also not acceptable.
So crowing that 'only' 3,300 illegal aliens who don't belong in this country were barred from the purchase of buying a gun in 2017 (as if there isn't an cumulative effect over the years, year after year) when 'X' number of them were denied for other reasons or when they slipped through the cracks entirely and actually managed to complete the purchase isn't much of a brag.