What was probably going on was that the on-scene FBI guys didn’t want Trump’s attorney to see the “basis” of the warrant, which would have been in the attached affidavit. And what Garland said they’re willing to release now still won’t be the basis of the warrant. It’ll just be the warrant itself, stating the address, what they were looking for, etc..
“We are going to Trumps house to look for stuff”.
Signed Reichsfuhrer Garland