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First, with respect to your coolant level going down, check your coolant reservoir for leaks or hairline cracks, especially on the bottom surface of the reservoir. Also, make sure that you have the latest version of the coolant reservoir cap fitted. If the part number embossed on your cap ends with "00", you have the "leak prone" cap. Most Boxster owners have changed to an "01" cap and IIRC the latest version ends in "03".
Double check your dipstick to make sure that you are not losing coolant into the oil. Not likely, but it doesn't hurt to check.
The MSRP for the half-shafts is about $650, with a discount available from online Porsche dealers such as Sunset or Suncoast.
There is nothing magical about Porsche half-shafts, and the old ones can be rebuilt by any competent machine shop that handles driveshafts for about $125-175 each.
Boxsters are known to have RMS leaks and/or IMS flange leaks in some instances, but I imagine if the shop that you had do the work is at all familiar with Porsches, they would have spotted that pretty quickly.
The dusty oil residue could be caused by a number of sources, such as a leak in the bellows from your AOS. Knowing which area has the deposits of oily residue would help to narrow it down.
Regards, Maurice.
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