That's not always true. The NDAs that I have signed have not prevented me from saying that I am under an NDA. Letting someone see hardware covered by that NDA would be a violation of that NDA.
And the US is probably the last place a pre-release...
Don't ever accept a cashier's check. It can take up to 3 months to fully clear, to find out it was forged, even with express clearing from your bank. Then after the bank finds that out it is fake, they will take back the money they gave you and...