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Yes, if they cannot produce the original judgment with the contract on which the original judgment was obtained and you have no knowledge of the original judgment (likely because they obtained it without ever serving you) then if the judge ordered them to produce it and they fail to do so this is grounds to file for dismissal with prejudice.
Furthermore, no, you should not tell them a word about you being essentially judgment proof until they produce the proof that this is even a valid judgment. If they do not prove the judgment is valid then no need to tell them anything. If they do prove the judgment and contract exist, then you need to consider seeking to vacate that judgment based on them failing to provide you any notice or due process when they obtained the alleged judgment.
The attorney being late depends on the judge as to whether or not they would have dismissed, this is the sole discretion of the trial judge.
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