Lol ... you will be fine as mentioned above ... they sound like they weren't traffic police.
I have had 2 strange incidents with the police in my late R32gtr ...
first week i got it i came out of the bottle shop , cruized up to the lights, took left hand turn and WUUP WUUP unmarked pulled me over where i turned into the side street because no parks on main road etc ...
I am thinking ohhh here we go ..the dreaded Skyline bashing etc ....i get out of the car the same time he does and we meet in the middle somewhere... He goes did you just leave the pub mate and i said sorta i just went through the drive through bottle shop > see 4pack of JD. He then goes ohhhhhhh i thought you had just left the pokies no worries . At this point i am like WTF , he doesn't bretho me but takes my license for a chekum. we both go sit in our cars .... I am getting a bit worried now thinking the worst that maybe there is an unpaid , hes radioing to his mates to do RWC checks, dont pop the bonnet , maybe he thinks i am Ivan malat etc ...cause hes taking ages... after 5/10 minutes or longer he gets out of his car and starts heading towards me with a huge grin on his face ??? I sat there going here we go ...
He reaches through the window with his hand extended and says beautiful car mate, Shakes my hand and introduces himself first name (this has never happened to me ever)... See ya on the road, bye...
I was Gob smacked
Later i found out he has an R33 Gtst as his personal ride... strangest interception i think i have ever had
the other story i will save for later ... 2 plain clothed D's that couldn't catch up to us until they did the flashing dash board thing ...lol