@Rogue said ..."glass causes air flow and UVB issues"....airflow can be dealt with with proper positioning of the lights to create a chimney effect. Re UVB issues...what do you mean?
I agree with removal of the sand due to possible impaction and the water dish needs to be removed or cleaned daily.
@sterlingrob what sex are the chameleons? IMHO you don't need to return them...you just have a steep learning curve to keep them healthy!
Before long I would replace the plants with real non-toxic plants that have been well washed, both sides if the leaves because veiled chameleons like to munch on plants at times.
Depending on their age and sex you may be able to keep them temporarily in that tank but it needs to be set up properly and it will get too small too fast...and at about 4months of age they should be separated because if thats a male and a female, as soon as they are sexually mature they will mate and there will be stress on them both as well.
To set that cage up properly you need the heat and UVB both as close to one end as possible to create a chimney effect and to allow the chameleons to move out of the heat and UVB at will.
You need to create proper temperature in the basking area (low 80'sF).
You need more cover/foliage for them.
You will need to prevent water from standing stagnant in the cage from misting.
Do you know about supplements? Feeding/gutloading the insects? Appropriate size of insects to use?
Once you answer the questions about age and sex and the ones in this post we can talk more!
Hang in there!