Hi,
If well protected with bubble wrap a telescope should survive the post OK even if the original box with its styrofoam packing has been thrown away. You might have to tweak the collimation but that is no big deal as long as you follow online instructions such as
my own:
http://www.stargazing.org.uk/collimate.htmlThe Sky-Watcher 130/900 is a good scope even if you don't get the parabolised version (130P). But it does need the motor to make it worth having, so I'd take the chance on the secondhand one . The other drawback is that it's not a straightforward matter to attach a camera or webcam, as the focusing range is not great enough, though you can do it if you use a Barlow lens -- preferably not the poor one supplied.
Robin