Unfortunately, the seller has never disclosed to me the address of my purchase hence I dont have any clue as to what I own or I need to take into consideration before engaging third party wallet recovery.
You don't need to know an address in order to attempt to brute force. The checksum will only be valid for 1 out of every ~4.3 billion possibilities, meaning you can easily simply look up the address of any valid key that you find.
None of this is relevant to you. It does not matter what type of wallet created the WIF private key you are trying to recover. It is either a valid WIF key, or it isn't. The only thing that might change is the locking script related to your private key, but you won't be able to even start thinking about that until you have successfully brute forced the private key.
I am trying to locate the seller or the sellers who had the capability of selling bitcoins during the period 2009 to 2011 and the name a few of them arise are Mt.Gox and Coinpal.
If X = Mt.Gox (exchange ) or wholesale provider.
If Y = marketer or internet marketing links/blogs administrator or distributor
If Z = purchaser or buyer.
What if the selling system was designed that bitcoins would be sold by the exchange Mt.Gox X (first party) on an order placement basis by second party Y (person who is marketing through link advertisements on internet such as Yahoo finance and other blogs) to third party Z (third party is purchaser or me in this case) then in this scenario X is instructed for delivery of bitcoins by providing the access authority or Privatekey to Z ( delivery destination email address).
In this above mentioned scenario, if I am the legal owner for accessing those bitcoins but by virtue if the privatekey provided by X without providing details explanation of how to execute the key and if it is not valid key then how am I going to own them.
There are other arguments which arise apart from this as well. Please give it a thought of the scenario I mentioned above and please let me know your opinion. Critics are welcome.
Thanks