Well the photo of the back shows the story. It does appear that while in was stored away a critter nibbled on the upper back corner.
I included a close up shot of the area so there is no debate as to how it looks. The photo makes it look more severe but the ruler tells you how small the section is. Right about 1/2 in the longest direction. Note that page #80 and all prior are not affected by this damage and the ones after get progressively worse as they approach the back cover.This is not visible when in a bag or sleeve. Only other thing worth mentioning is the fact that is doesnt lay quite flat. It was stored with other items and would just need time to flatten fully.
If you need more photos please ask. I can only upload 12 and these tell the best story. The item "Nintendo Power Magazine First Issue July/Aug 1988 Volume 1 With Poster & Mailers" is in sale since Saturday, May 22, 2021.This item is in the category "Books & Magazines\Magazines". The seller is "bdwaris" and is located in Milford, New Hampshire. This item can be shipped to United States, Canada, United Kingdom, Denmark, Romania, Slovakia, Bulgaria, Czech republic, Finland, Hungary, Latvia, Lithuania, Malta, Estonia, Australia, Greece, Portugal, Cyprus, Slovenia, Japan, China, Sweden, South Korea, Indonesia, Taiwan, South africa, Thailand, Belgium, France, Hong Kong, Ireland, Netherlands, Poland, Spain, Italy, Germany, Austria, Bahamas, Israel, Mexico, New Zealand, Philippines, Singapore, Switzerland, Norway, Saudi arabia, Ukraine, United arab emirates, Qatar, Kuwait, Bahrain, Croatia, Malaysia, Chile, Colombia, Costa rica, Panama, Trinidad and tobago, Guatemala, Honduras, Jamaica, Antigua and barbuda, Aruba, Belize, Dominica, Grenada, Saint kitts and nevis, Saint lucia, Montserrat, Turks and caicos islands, Barbados, Bangladesh, Bermuda, Brunei darussalam, Bolivia, Egypt, French guiana, Guernsey, Gibraltar, Guadeloupe, Iceland, Jersey, Jordan, Cambodia, Cayman islands, Liechtenstein, Sri lanka, Luxembourg, Monaco, Macao, Martinique, Maldives, Nicaragua, Oman, Pakistan, Paraguay, Reunion, Uruguay.