Not to make you get careless, but just to ease apprehesion....
My AMD 486-133 ended up in the aquarium overnight (long story). Still works fine.
My current Athlon 650 oc 800 has been run under the faucet a few times now while scrubbing the Artic Silver II off with a toothbrush and handsoap. Shook it a few times, used a dry brush to get some of the water out of the pins (ok that was pushing it) and tossed it back in the computer.
Posting this message from that computer. Haven't managed to kill a CPU yet, though with one side of this core cracked off and both corners on one end so the flat surface is an oval now, not a rectangle, I'm probably getting close

Guess I want a faster one subconciously.
Now, reusing the thermal pad like you describe is a no-no. That your temps haven't gone up rather surprises me, I guess if they stay like that then leave it alone. But if you take it apart again, clean it all off the heatsink (various products work, lighter fluid is what I use) with some solvent and cloth, don't use anything metal to scrape it. Then apply heatsink compound and put it back together. Artic Silver II is the recommended compound by most around here.
Watch those temps closely the next few days, hate to see anything happen. Like I said, if it's staying the same, guess you got lucky, go with it.
--Mc