We generally don't lock threads like this, as it's always possible someone else may have a new question about the issue or even a new suggestion related to the topic. Threads that are locked around here in Community Questions and Feedback are those that are completely answered with no further chance of discussion, those with overly out of control and spammy responses, or for other necessary reasons. Otherwise, we just let the issue die after its been answered.
...but that's just for future reference. Good luck with all your future trades in the Trade Corner though. :]