Many vendors have a blanket "nothing possibly controlled to USA" restriction on shipping to prevent the untoward possibility of customs seizing the package and then ending up either liable to re-ship more, or enduring bad word going around about their shipping, legitimacy, association with LEO, etc.
Once more I must caution, until I find someone who has done the hard work to verify what they are consuming is deschloro-K (ideally, independent third party GC or LC-MS, but a TLC plate stained with Mecke/Marquis, melt point, NMR, anything really apart from a "bioassay of faith") I would take any information about this compound with a grain of salt.
The last round of "ketamine analogues" were reported to be utter trash, I wonder if it's because they were actually crappy compounds, or was it the case that people were using it as a vehicle to sell excess crap from their inventories a la NRG-3?
Needless to say if I can ever get my greasy hands on it I will give some objective tidbits, and do the analysis myself...