All you also have to do is remember the name of the script. And then Google it.
For example, suppose someone did a /ctcp <Your Nick> Version. Then likely, your script would /ctcp back the script's name. Find someone that has old logs or a better memory.
Usually the name of the script is everywhere in your mIRC, to when you open it, the titlebar, etc. Most scripts I know of have to be relayed by default in the quit message and such. So find someone whom has old logs and a good memory.
-Neal.