Mouth of Sauron at Erebor ?

[The Might]

As I was reading through another thread, I suddently came across this quote:

'Then about a year ago a messenger came to Dain, but not from Moria - from Mordor: a horseman in the night, who called Dain to his gate. The Lord Sauron the Great, so he said, wished for our friendship...
'As a small token only of your friendship Sauron asks this,' he said: 'that you should find this thief,' such was his word, 'and get from him, willing or no, a little ring, the least of rings, that once he stole. It is but a trifle that Sauron fancies, and an earnest of your good will. Find it, and three rings that the Dwarf-sires possessed of old shall be returned to you, and the realm of Moria shall be yours for ever. Find only news of the thief, whether he lives and where, and you shall have great reward and lasting friendship from the Lord. Refuse, and things will not seem so well.'~The Council of Elrond

Could it be that Mouth of Sauron was sent to Erebor to deal with the Dwarves ? Are there any indications that he was the one sent ? Or was it someone else ?