As threatened, the Sisyphus Office exhibit has moved to the Contemporary Arts Museum in Houston where it will run until the end of September. The museum has tried to remain true to the original concept of having the work live in an office environment rather than just hung in a gallery, which explains why it's hidden away in various obscure locations (that's their story anyway).
There's a Sisyphus Office table that greets visitors when they come in. It provides visitors with a Sisyphus Office file, complete with an explanation of the whole idea and a map that guides them around the Museum to wherever the pieces have been integrated (often in places visitors normally never tread). Visitors then stamp their file in a beautiful bureaucratic way and head off in search of the works.
Sadly there is absolutely no mention of the whole thing on the CAMH website, so I only have the organizer's word and the above crappy photo to prove this isn't just a figment of my imagination. If anyone reading this does visit the show and manages to snap any pics, I'd love to have them.