Two Kids One Sandbox Original Video Install |link|

The earliest mention of the exact phrase appears on on a now-deleted Kiwi Farms thread. The OP claimed to have a “rare Russian sandbox video” that required a special “installer” to decrypt. No user ever verified the file.

There are various artistic or commercial projects with similar names: There is a 2006 short film titled " Kids in the Sandbox " listed on IMDb . two kids one sandbox original video install

It features adult performers involved in a highly disturbing and medically dangerous act known as sounding (inserting objects into the urethra). The earliest mention of the exact phrase appears