That's really not fair to them right? Everyone should get their 5 bonus sigils!
No, that's wrong. If you weren't around to unlock your bonus sigils, too bad.
Was it random to get in to beta? Yes.
Was it a nice gesture for Blizzard to throw us a nod for taking part? Yes.
Can they actually determine who (that got a license) actually took part in the beta? No. That's why everyone who got one is getting the FoS.
My advice? Get over it.
With the 5 bonus Sigils, you too have a way to prove you were around since the beginning.