I got the exact same basic inquiry for a window I was selling online.  I said cash only please, and she said she was out of cash and so she'd use a cashier's check, which makes no sense.

You're very smart to not fall for this scam.  They would have sent you a fake check for more than you ask for and they would have ordered you to wire the difference to them.

I posted a sofa & queen ann chair for sale on craigslist and I received several text messages..the person said she wanted to purchase the sofa & chair for the sale price of $150.00 ..."but" due to her busy schedule her shipping agent would be handling everything. I texted her back and told her I would only take cash and will give a receipt and she was responsible for picking up the sofa.    I am thinking this is a scam because who would purcahse what I have for sale for $150 and pay an agent to handle shipping and everything..especially liveing in Nebraska & I am in Illinois..."crazy"??.They probably think they can scam me into taking a cashiers check or money order..who knows!  I'm not falling for it!!!   Buyers "beware" just as well as "sellers' need to beware of scams!