need a part number for the power supply for tplink ac1200 model number/archer mr600. company i worked for wanted a small set up in a portacabin for a couple of weeks so they  bought the router only to find no psu in the box, rather than buy the psu they went and bought another router. now they have left they the took the working router with them and left the one with no psu so now we have no wifi! have looked in the usual places but to many 'compatible' psu's to choose from...help please with model number and/or where best place to buy as  i cant find the option on the tplink website