It's been reported several times that when LE went to the door, parents refused them entry and said to contact the lawyer.
Are you thinking that somehow LE had a stealthy visit with BL? I've personally never heard of that. I think they'd go for a subpoena, because he has clearly stated that he doesn't want to speak (via his parents and his attorney). The attorney has said his client is not available to speak to LE.
What more would you like to hear on that topic? I really don't see any evidence that BL left the house and met up with LE - his parents have reported him missing. If LE did run into him, they'd make a report (immediately, IMO). Heck, with all the people following this case on scanners, I think twitter would be full of reports if BL "ran into" some policeman and started talking.
Here is just one of many articles with the lawyer's statement that he won't be talking to LE:
Attorney for Brian Laundrie, missing person Gabby Petito's boyfriend, addresses those 'wondering' why he won't speak to authorities
Of course, he's not really missing (according to the family), but only "hiding," so that even if LE sees him, they have no reason to approach him and I'm guessing he's not going to be very chatty.