I'm going to brainstorm some ideas on how a suicide might ensure that his body wouldn't be found:
1) He could find an out-of-the-way storm drain to crawl into with a razorblade or a bottle of sleeping pills.
2) He could climb into a dumpster with a contractor garbage bag and tie himself into it from the inside.
3) He could sneak into a steel mill and jump into a vat of molten steel when no one was looking.
4) He could tie weights to himself and jump off a boat into a deep body of water.
5) He could find an abandoned house, fill the bathtub with acid or lye, and then climb into the tub.
6) He could dig a hole a rig it so that the dirt would fall back into the hole after he was in it.
7) If he knew where a large concrete pillar was going to be poured, he could climb into the form and wait.
8) If he knew of a large hollow tree, he could climb into it.
9) He could hike into the mountains and look for a very remote spot.
10) He could burrow into the deep muck of a pond or creek.
11) He could steal the identity of a dead person whose death had never been reported to the SSA and then then kill himself openly, knowing that he would be found but misidentified.
12) He could go to the nearest dam on a river and then jump in, knowing that his body would be crushed to bits.
13) He could find a hidden cavity in a building or other structure and crawl into it.
14) He could jump into a natural feature, like a volcano or sinkhole.
15) He could slither deep into an abandoned coal or anthracite mine.
I'm not suggesting that Ray did any one of those things; I'm just trying to figure out reasons why Ray's body might not have been found.