Exactly... and the best defense would be to produce his REAL long form birth certificate.
Here's a little thought-exercize:
If someone were "to produce his REAL long form birth certificate," what do we think the obotz would do?
Personally, I think they'd quickly realize that since they could not force it to disappear, and could not disprove it on the merits, they would fall back on a massive "security by obscurity" gambit, along the lines of that hackneyed old plot line in which the good guy is battling with the evil beast that looks identical (or nearly identical), forcing the friendlies to stand back unable to act.
In the realm of documents, it would be relatively economical (given beaucoup deep pockets to reach into for "supplies") to come up with a plethora of "nearly identical" documents.
In fact, if they're even slightly brighter than a rock, they'd have anticipated the probable eventuality of disclosure, and prepare numerous "nearly identical" documents at their leisure, perhaps planting some in "deep cover" source positions so as to plausibly claim that "THIS is the REAL one."
The logic of course fails at "face value" (to "coin" a phrase ;) It would be tantamount to my claiming that the five dollar bill in your pocket is counterfeit -- and, asserting that I can PROVE it to be bogus -- because I hold here in MY hand a "nearly identical" bill (why, even the SIGNATURES match!), but, there are enough DIFFERENCES (different colored stamps, different dates, names of reserve bank offices, etc.), to "prove" that at least ONE of them is not real.
I could then fish out a few MORE bills from my pocket, feign shock, and exclaim, "Oh, my ghauwdde! Look at how MANY fakes there are flooding the place! Clearly, we MUST dismiss ALL of these things as OBVIOUS fakes!"
I'm having a bit of a deja vu moment, oddly enough. It's as if SOMETHING is reminding me of this hypothetical scenario. Oh, well, I'm sure it's just a coffee deficiency and lack of sleep. Let's all move along now, and Obey Bill O'Reilly.
Wow, another really ODD thing. I've got this weird urge to rush out and buy some loofah... and falafel.
Weird! Go figure.