No, Loki did not know the value of the bottle. He had never considered it in the first place. There had been no harm done to it. Only that it now rested unprotected.
But at least the man had a little bit of sense. "Good. I will." The ability to hide those memories meant he could speak a little bit more openly. For a second he considered the deed. But he had planned for this. He could prime the necessity before he forgot why it was the case. If he were to do this repeatedly, he might need to adjust the spell he used for his own protection.
"Why not just tell me? Are your words not good?" he asked. This was another complication. He was cut off and it did not just go into one direction.