hmm maybe some kind of glitch from the DEQM from earlier in the year. If its me I'd also err on the side of caution and pretend such extra miles dont exist. AS might remove them eventually or might not depending on whether they realy care that much or not and what other more important issues they have going on. Most likely they will only notice if they do a random audit on your MP account but again Im not the best or the most lucky gambler in the world and it would be just my luck or lack thereof of luck that my account would be the one audited so I say have him/her do the MR!
I had a flight post twice last year that gave me an additional 1000 EQMs. I ended the year with 47K and some odd change so I wasnt concerned with it. To the best of my knowledge they were never removed but I dont know for sure