Agent Says there are Other Offers

[Adam Varone]

I'm looking at a duplex, and decided to reach out to the seller agent to represent me to try to get a better deal. I think the property is about 10% overpriced. The agent said there are other offers, but I think he's just trying to get me to put one in myself. He mentioned they accepted a house sale contingency offer, but are backing out of that one. I don't think this is true because the house never went "under contract" on the MLS.

Is this a common occurrence where agents make up ghost offers? If an offer is accepted with a house sale contingency will it be shown as still available on the MLS?