I just received a ebay lot and went through it to check it was all there.
Well, turns out there are three copies of
B2 included; two of which go with Basic Set 1 boxes - all showing normal use wear. Then I have this extra copy of
B2 in mint condition. It has 1st Printing guts but later printing cover. The giveaway was that the guts are about 1cm larger than the cover. It also has stacked product/ISBN on back cover. I have not checked to see what printing that is.
Anyway, it is a Frankenstien. The other two B2s are later prints inside and out. So, basically, shit happens. Neither cover corresponds to a first printing, though.