Purchased domains fallen out of SERPS

I purched domains and after the transfer they are gone from the SERPS

[guru84]

Hello,
I am new to this so I tried for the first time purchasing existing domain names. I bought 3. All had page rank and ranked with I searched for their title. For example if the domain was name-example.com and I searched for name example the site was one of the first results.
I bought them from Sedo and paid quite a lot for them. After I bought them, all 3 have dropped from Google for anything except their domain. So now they all only show up when I search for name-example.com.

Is this normal and will they return? I feel like I've been douped out of a lot of money.

Any help greatly appreciated.
Thanks.

[buckworks]

What content is on the sites now?

How does it compare with the content they had when they were ranking?

Also, has something changed about their backlinks?

[guru84]

When they were ranking they only has the Sedo for sale page. Now they have content similar to what they had before they were for sale. I don't think anything much about their backlinks has changed.

[Jane_Doe]

When they were ranking they only has the Sedo for sale page.

Google is a domain registrar so maybe the for sale page and an update to the whois reset the domain to a new domain status. I don't know for sure but I am leery about buying any domains with parking page or for sale page because if I were Google that is what I would do.

There are also some scammers out there that try to sell keyword rich domains that rank with with no content except the "for sale" pages. I think the domains rank temporarily because they forward other domains to the for sale domain until the sale goes through.