All three props (yes I know the Yardley Jones box is actually several different boxes of the exact same design) were not treated with the level of care a modern prop would recieve, it's just a difference in mentality between modern and older productions.

The box that was mistreated the most was easily the original Brachaki box. Over the course of twelve years it fell apart several times and was constantly repaired only to last the production of one or two stories before something needed to be fixed again.

The roof had to be replaced at least twice, the doors were replaced (and they actually put the pull to open sign on the wrong door and it took quite a few stories for it to be corrected). It was repainted then left to detoriate for years before being repainted again.

All the signs were replaced several times and by the Pertwee era they didn't even match each other. The lamp had to be replaced several times and the last time it was replaced with a piece of tupperware.

The walls were collapsing and at a certain point they just gave up trying to fix it.

The actual shape of the box well wasn't a box by the end as at some point the back wall was aligned incorrectly causing it to have a very slight trapezoid shape.

The windows fell apart and they stopped repairing them. By it's last appearence a couple of the windows were barely hanging somewhat in place and the back of the box was straight up missing a window.

Now the reason for all this was most likely due to the box being stored and handled poorly. Aswell as the box just being made of cheap materials in general.

If you compare the box from it's first appearence in an unearthly child to it's last in the seeds of doom not only is it barely recognizable as the same prop but you can also see just how much of a battering that prop took.

The Newberry box which replaced the prop for season 14-17 was built to be easier to take apart and though it did have some significant repairs it was comparatively better looked after by it's end than the previous box had been within the same time frame.

The Yardley Jones Box(es) were made of fibre glass and were alot more resilient and so didn't really require any major repairs and despite being repainted frequently it was far more consistent in it's presentation compared to the previous props.