1) You can't "pull it back"

2) You 'could' print out F 8??? and mail the F 1099-B to where ever.  I've heard the rumors there's a HUGE warehouse somewhere that has all the previously mailed once (back before attaching was the way to go...) are stored.  And that they are just molding away, never to be looked at.

3) I wouldn't worry.  IF/when the IRS asks for any details you can provide them then.