Hello,
Hmm sounds odd, swift leather should be feeling dry or lack luster from simply being stored in the box... generally, that leather being a very modern tanned and finished leather should not require deep conditioning...deep conditioning swift leather could result I a overly soft and floppy and stretched out leather so I would caution you. So, what makes you think its dry? Or is it simply you think it doesn't seem as rich looking as it once did? A simply light conditioning and shine type leather care wipe can often help in such an instance do be careful not to use any oily type care wipes as they could stain, remove finish or leave streaks. Always test a small hidden area first.....before moving on to larger visible areas.
Help me out... with some more information and a photo or two if I'm not clear enough or so i can better assist you ok?

All the best,doc