Deleted launch agent and lauchdaemon files
Unfortunately I had some frankly unhelpful man from Apple support telling me today to delete contents of launchagents and lauchdaemons folders in library, on the basis that I didn't need them. The problem started with an issue with iTunes store not loading properly and foolishly I contacted Apple (what a mistake). After telling me to delete these items and the cache folder and reinstall iTunes, the issue persisted and in the end he told me to reinstall my whole system from scratch as the problem was in the OSX (mavericks). Luckily I didn't have time and told him that I'd do it later, which turned out to be completely unnecessary as later iTunes was working fine.
My issue is I think I put the launchagent and launchdaemon files back in the correct places, but not 100% sure, and have since deleted the contents of the trash, so can't check if anything in there that shouldn't be. I have checked in TM backups and the folders have all the same content and all seem to be there, but having read that you do need these files, am now paranoid.
Why do Apple have technical support that have frankly not got a clue (this is not the first time I've had problems with them and you'd have thought I would have learnt my lesson by now!).
iMac, OS X Mavericks (10.9.5), null