Hmm, maybe you can use Rambo as a resource for shipping between the US and Philippines?? You'll just have to avoid telling your courier in Philippines that it's a biological substance...maybe just tell them it's a 'science kit' or toy or something like that instead of a biological substance?
I shipped mine several years ago from Philippines to US lab and it worked but that's only because I was lucky enough to have a nice lady as the attendant at the shipping station in the mall. I tried later on with a LivingDNA.com kit to ship to the US and it was a different lady attendant at the mall and she wouldn't allow it for some reason lol.
So maybe have Rambo ship you a kit under his name since you can have multiple accounts under one credit/debit card number (like how I have me, my mom & dad & sister all under my sister's card-account in the US).. Then ship your sample back to Rambo, then have him drop off in the mail dropbox in the US?
That's the best solution I can come up with
I can't even guarantee my method will work, cos there was a time when I was trying to ship back a LivingDNA kit and they rejected it at the mall in Makati, though the first time I shipped back my 23andme kit from PH to US it worked..but you'll have to ship back to your contact in the US since 23andme scraps any kit shipped back from countries where they don't offer their services to. But maybe if you just explain to them that the saliva sample is harmless then they may allow it, but for sure Rambo can ship you the kit from US to PH..that part will be very easy, just shipping it back to Rambo your contact will be the harder part.