Boris was suppose to pick up Anne's bedding. They edited it to look like he didn't pick it up on purpose. They didn't show if he was actually in the same store, they didn't show him asking about it, they just showed him smirking a lot.
Every season seems to have a villain and why not make it the Russian guy? I doubt we'll ever really know for sure, Boris said he didn't do it on purpose.
First let me make a correction, Boris is German, not Russian. I just read the blog and Abby has posted on there that she was with Boris when he made sure that Anne's bedding was going to be sent. She didn't say why it wasn't.