Good question
Internal memos show an initial report of the powder being found on the lobby floor of “redacted”. Later memos claim it was found in a cubby. Watters does a good job of pointing out the inconsistencies and offering some plausible interpretations of what really happened. He points out that, the pictures of the bag found in the cubby, which is the latest secret service claim is contradicted, not only by the earlier claim of it being found on the floor, but on the redaction of the actual room on whose floor it was found. There would be no reason to keep the room redacted if it were found in the cubby room, as they are openly claiming.
The FOIA also reveals that, contradicting earlier claims, three samples of DNA were found on the baggie, have been retained, and are currently in storage. There are also conflicting reports of the substance being cocaine, an opiod (possibly fentanyl) and amphetamines. The actual substance, BTW has been destroyed.