Wellcome to all ! I need Old Testnet Chains for my own research, so i`d like to know if they are available for download somewhere. Or are they lost? 
Apparently, there were 2 former testnets prior to the current testnet. Information on the wiki:
https://en.bitcoin.it/wiki/Testnet
Quote
There have been three generations of testnet. Testnet2 was just the first testnet reset with a different genesis block, because people were starting to trade testnet coins for real money. Testnet3 is the current test network. It was introduced with the 0.7 release, introduced a third genesis block, a new rule to avoid the "difficulty was too high, is now too low, and transactions take too long to verify" problem, and contains blocks with edge-case transactions designed to test implementation compatibility. On the December 21 of 2015 SegNet was deployed, to test the Wuille's Segregated Witness proposal.
Im not sure if someone saved them for historical purposes... I guess someone still has them and could post them there. Trying to download them with the old clients wouldn't work because I doubt there are any peers anymore but you could try.
