Tous being used to mean "all of them"

Question

This was the question:

"Tu as les billets ? Oui, je les ai tous" means:

From a drop-down multiple choice, I answered that it meant "I have everything" but I wasn't sure that was correct because of the "les"

The correct answer was, "I have all of them," but couldn't that be written as, "J'en ai tous?" That's where I got confused.

Accepted Answer

Hi Joanne,
Je les ai tous = I have all of them ( the tickets being replaced by 'les')
J'ai tout = I have everything
J'en ai tous is incorrect and has no meaning in French if you wanted to say I have a few of /some of them you would have to say -
J'en ai quelques-uns 
Hope this helps!

Answer

Oui, je les ai tous. -- Yes, I have them all. This makes no reference to any group of things of which you have taken some or all.