This is a minor issue but I'm sure it can grate on your nerves after a while, so I decided to shoot the spit about a zone where buckling on the 435/532's shell is highly audible; specifically below the power button, which takes away from congruently sturdy. Please note; on the assembly line, while the guts of your phone may be built on one line, the housing is often split between two areas: Sealed Body, and the Battery Cover. This results in inconsistent sturdiness.
You'll want to use this tape, but a very tiny piece for this simple fix. I'd prefer Surtape Foil Tape, for its low friction and very thin, clingy adhesive.
(DISCLAIMER- NEVER APPLY TO OR ADJACENT TO BATTERY CONNECTIONS)
There is a small 'square' tab on the front facing body that sits a few millimeters down from the exposed switch. It's distinguished by an exposed outline where the shell snaps onto (lower middle-right). This area of the plastic sits a hair lower than normal, causing the posts which hold the buttons to the shell to buckle. You'll want to only apply tape here, as the left side provides the spacing necessary for easy removal.