Fairly small. *3 seconds at 350C isn't going to do much. *You can
probably do some damage is you overheat, or thermal shock the parts,
but in general, they should survive. *Whether the original components
are any good is subject to some speculation. *After 20 years, you'll
start to see the effects of package leakage, vibration, broken wire
bonds, water incursion, etc. *I suggest you use IC sockets on your
random non-critical projects.

Excellent, thanks for the advice. Most of the boards I am harvesting
from are old computer-related boards that were never used, or were
used very little. I have had many jobs in the IT industry and used to
snatch up any old (but new or nearly new) equipment I saw, regardless
of whether I needed it or not


Google finds hundreds of hits under "IC tubes" and "package carriers".
For example:
http://store.staticspecialists.com/ictubeshippers.aspx

Thanks, Jeff. I honestly can't explain why I didn't find any when
looking before, I think I was using the search term "ESD storage
tubes" maybe that was the reason!

Thanks again.