I'm going to point you to a
thread where Lostinlodos helped me with some pins if you want to read a little more info.
Top picture definitely is pins, just make sure they have gold on them.
Second picture, I'm assuming is a closer look of a sampling of what you have from the first? Small ones from ribbon cables or similar are fine as is but if it's like the one rectangular one where there's a good chunk of non-plated material you'll want to trim the gold part off.
Third (and again assuming 4th is a sample?), aren't pins per se but if you trim the excess they should be good togo with pins, maybe keep them in a separate bag in case Boardsort doesn't pay as much for them.
If there is stainless on the heatsinks I would consider that dirty aluminum/copper heatsinks which is a fair bit lower price. Personally I always separate the heatsinks to get the copper off, depending on how easy it is I'll clean other metals off the aluminum but I don't go to a lot of trouble to make all the aluminum clean.
