I agree with Scruffy. When I've sold phones on ebay, I just say in the description that the ESN is clear and guaranteed to activate on the network or I'll refund the money. I've never bought or sold anything on Craigslist. Never even been to the website, for that matter. However, if the person is really getting that aggressive, is it really worth selling it to them? I've gotten messages from ebay buyers asking for the ESN. I always repeat that it's guaranteed or their money back, but that I cannot give out the ESN. I know that there's a slim chance that someone will clone the ESN, but it's just my luck. I'd rather sell the phone cheaper (or not at all), rather than have a brick that I can never sell (or even use) again.
This confusion can easily be avoided if you pronounce the word intended aloud. If it has a voiced Z sound, then it’s “lose.” If it has a hissy S sound, then it’s “loose.” Here are examples of correct usage: “He tends to lose his keys.” “She lets her dog run loose.”
not rigidly fastened or securely attached
to miss from one's possession or from a customary or supposed place
Also, just because a word has an "s" at the end, doesn't mean it needs an apostrophe.