I'm glad you asked about the 'Tropical' designation, as I have been gifted quite a few boxes as well. All are designated 'tropical' (makes sense as I'm in Australia!), none larger than 8"x10", and either the Polygrade-V Cold Tone or Polywarmtone. I've only done a quick test of one of the warmtone papers thus far.
The highlights are perfectly clear and it has good contrast. The only surprising thing was the excessive length of exposure needed. As a small 4"x6" piece of paper, I'd expect Grade 2 f/8 5sec. to be about right. It took
64 seconds at f5.6 to print "correctly".
I'm gathering that, being warm tone, it's a predominantly chloride halide paper, going by my small experience of old contact papers. Just something to be aware of when you get a chance to make some prints with it. Having Mr. Robin Bell check it out for you is a bit special!