Right, that's what I'm thinking is also the issue here, the OP deleted their original 1.0 characters back in 1.0 years ago and so they cannot be restored, that only 1.0 characters that were still intact at the end of 1.0 can be transferred into ARR (my boyfriend also had this issue back when ARR launched in that he deleted his original 1.0 character back when 1.0 was still running to create a new one, and only that new one was available for him to transfer into ARR).
And if the Mogstation/SE Account Management System is saying there is no trace of 1.0 on your account then alas you probably cancelled your entire original 1.0 service account which also completely deletes the game code attached to it as well as any characters, thus losing everything forever. Unfortunately, I don't think there is any way you can retrieve this information now I'm sorry.
Not true. Besides my 1.0 main I also had an alt in 1.0 that was still level 1 and I had never done anything with beside the opening movie in Ul'dah... and I could transfer her into ARR as well (and had the meagre gear she had started 1.0 with). She also had the Legacy mark as well.
So level and whatever you did in 1.0 does not determine whether or not it that character can be transfered into ARR, it just has to have been created in 1.0 and played the opening. That's all that is needed. If that character was set as 'cancelled' in your list of Service Options in the SE Account Management System at the end of 1.0 it can still be transferred. 'Cancelled' and 'Deleted' mean two different things, cancelled just means the subscription for that character was cancelled but the character data remained on SE's servers. Deleting that character is exactly as it says: the character data has been completely deleted from SE's servers and is unattainable. Deleted character data cannot be recovered and it is this situation that is the cause of where a character cannot be transferred into ARR.