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It's good practice to use a tap safe additive product but a few weeks without using it is unlikely to harm the fish. It's more important it has relatively clean and unpolluted water at the right temperature and some grub to eat.
To that end if the tank is near a window then lower the blind a bit which will shade the tank and hopefully marginally improve the water quality and pollutants in the tank.
You should also punch whoever was responsible for getting it in the office and who then decided it wasn't their responsibility
Funnily enough i used to work in a fish warehouse when I was a schoolboy.
If I were you just go over there , clean the filter out using the existing water, rake the gravel up a bit and get any shit out that you can , do a partial water change (10/20pc is fine but make sure the water isn't too cold) then lob one of those feeder things in and you should be ok for a while, as long as you keep doing the partial water changes every 14 days.
Moving the fish should be an absolute last resort.
It's a kind thing you are doing.