The detail for Box 17 Code K should appear on page 2 of Schedule K-1 under Additional/Supplemental Information. If you didn't fill this out when you prepared the K-1s for Form 1120S, you will need to go back and complete the K-1 to include the sale information from Form 4797. All shareholders will need this detail to complete their personal tax returns.
For your other questions:
1) Purchase Price - the amount the asset was sold for, not necessarily the net amount that was received by the seller.
4) Expenses of sale are commissions and other costs paid out of the proceeds.
8 ) Section 179 Disallowed, if any, should be included on Form 4797 page 2.
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