Yes on the disclaimer and disclosure but the issue not only manufactured but the septic could be long with no exact time or cost. Although its his responsibility of the seller, it could be a long dragged out affair near winter. This is how it went Contract then termite inspection then house inspection then septic inspection then appraisal. This was done by the agent, being new to this, this was the order from them.
When you say “yes on the disclaimer and disclosure,” what do you mean? The seller should have provided one or the other but not both
And you presented your offer with earnest money BEFORE a termite inspection, house inspection, septic inspection, bank appraisal?
And you had NO contingencies?
Hmmm. Your agent appears to have steered you wrong.
I think you can ask for your deposit back ... and hope that the seller releases the money. I don’t see, from what you have described, that you have a great claim to it.
IF you get a refund and IF you decide to purchase another home, I recommend you find a Realtor with good experience.
Good luck.