Seeking some guidance on IRS addresses & haven't been able to track down exactly what I need. TLDR: Can you ship certified USPS mail to IRS PDS addresses?

We use stamps.com for all in-house mailing, certified included. Works great 99% of the time. However, there are some IRS mailing addresses with no street address and no "zip+4" codes that it can't decipher. Example:

DEPARTMENT OF THE TREASURY
INTERNAL REVENUE SERVICE CENTER
KANSAS CITY MO 64999

Stamps.com will not print such addresses as-is & will "correct" the address to what is typically the PDS address. However, I cannot confirm anywhere whether or not it is acceptable to use USPS to ship packages to the PDS address.

I think in this case I will just use UPS to be on the safe side, but would much appreciate if anyone can direct me to an official answer, or at the very least share some experiences. Thank you in advance.