Hi, I shipped two packages with order # shown above in subject line with a total of three textbooks for sell back to Booksrun: Package #1 (USPS tracking #: 9449036205262353254701) 1. Organic Chemistry (Janic Smith, 6th ed) 2. Study guide for the #1 textbook The quote for these two books was $102.29. The package was delivered on April 26th. Package #2 (USPS tracking #: 9449036205262355566567) 3. Organic Chemistry (Marc Loudon et al, 6th Ed) The quote was $39.73. The total payment should be $102.29 + 39.73 = $142.02 However, I received emails from Booksrun saying that the two books in the 1st package are missing. The total adjusted payment from the email was only $39.73. This must be a handling error. Please check with your staff and have the error corrected. I should receive a payment of $142.02 for the three books I shipped you. I personally packed them and dropped off at USPS office, and tracked that the delivery was successful. Thank you for your help! Zhibin Guan