I am not aware of any vendor or bank that purges order or transactions after 24 hours. Amazon keeps years of purchase history, and even some history of what you looked at.
Ant to what extent can a subpeona force a business to go to try to recover data? Can it mandate stop of writes to the drive with the data followed by use of deleted file recovery programs? I'd guess that there is LE software that has features like scan contend of deleted files not yet overwritten. This is harder on Unix/Linux since the file systems on Unix tend to overwrite recently freed space, whereas NTFS does the opposite leaving a very long history of recoverable deleted files.