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I suppose if you are really serious, the mirror/cell can be removed and packed to avoid damage. In my experience, placing the mirror/cell back in the tube doesn't present any problems and collimation is either spot on or close to spot on and doesn't that long.
I recently purchased a new SkyWatcher Black Diamond 12" Newtonian reflector OTA and upon opening the box the the mirror was missing! It turned out that the courier was on the lazy side and delivered it a few days later. Naturally I was quite happy after receiving the mirror as it was extremely well packed as to avoid damage in transit.
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