Good question, Pat. I've never been below Hwy 27 to see those holes, so I can't say about them. Mark Michaud told me that you can find traces of the Biarritz (#6) and a few of the other holes near the railroad. I know from the driving range you can see on the right side the old M/R 11th (Eden) green. You can still see the M/R fill pad on the current 3rd green. Flynn extended the front right of the green but its been lost. The M/R greenside bunkers of #1 are Flynn's right side fairway bunkers. You can still see evidence of the M/R green in the rough. There's a slight depression early on in the 1st fairway that is the remnant of a M/R bunker. I'm not sure since I've really only been considering the area included in the Flynn design, but I think the M/R 2nd green and 3rd tee are where the maintenance buildings and parking lot are. Since George Bahto studied the M/R version in areas other than where the Flynn course is situated, he'd be the best guy to answer this interesting question. Aren't some of the practice holes on the right as you drive in part of the M/R? Maybe 4 tee and 5 green? Just to the left of the beginning of the current 14th would be M/R 16th green, but I haven't noticed it out there. It is possible that the M/R 15th green can be located left and short of the left greenside bunker on 8. The nearly surrounding bunkers of this Cape hole should be easy to spot if carefully searched for. The current tee box used on 7 is the original M/R tee box for this, their 14th. Certainly it is easier now to look for pre-Flynn stuff now that so many trees have come down. Back in the days of Flynn's redesign, the fill for obsoleted greens might have been used during construction around the course so some might be lost.
By the way, Tom and I were at a dinner at Merion this past Monday and we think we found the original 13 green site below the caddie shack. I used to think it was where the shack is, but I am pretty sure we found it below that--it certainly looked like an old green site.