It is not recommended that the Boxster be in long term storage with the suspension unsprung. If you're only talking about a couple-few weeks, I think you'll be fine.
The thought process here is that the unsprung suspension causes parts to be exposed to air for extended periods of time. Not ideal.
Yeah, I kinda thought that might be the case. Not sure how much choice I have. I'd lower it back down to the ground, but I still have no motor mount in it. The engine's being supported by the scissor jack...
"Long term" here is defined as months and months, as in during winter storage in a cold climate. A few weeks I wouldn't even begin to worry about, especially if it's in a shop or garage with reasonably low humidity.