My bear-proof container (which would also seem to be a TSA-proof container) was deemed suspicious by the machine operator, and required the TSO to open it (with my assistance) and inspect. The contents were an odd collection of miscellaneous items (a nylon jacket, plastic baggies with coins in varying currencies, several music CDs in cases, and more). The TSO eventually repackaged it (with some minor damage to the CD cases) and returned it to me without comment. The same container (with the same contents) made it through re-screening some hours later in Tokyo without difficulty.