The Paper” has unveiled its debut issue — but it had to check in with an old friend first.

As you might have heard, Peacock’s new series (now getting a re-airing on NBC) is a spinoff of “The Office,” and Monday’s premiere wastes no time in letting us know how the two shows are connected. It opens by telling us that in 2005, a documentary crew began following employees at a Scranton office… and 20 years later, they returned. We get a shot of that familiar business park, and good old Bob Vance (“Vance Refrigeration”) is still there. Dunder Mifflin, though, left the building a while ago,…