The choice between doing the work to dig up two posts, back filling the holes with top soil, then digging holes to reset those 4x4 posts.
Buying & cutting one 8ft. long pole in half to put 1 ft. underground & 3 ft. above ground like those are . I'd rather buy unused new poles for $4.58.
Landscape Timber Cherrytone (Common: 8 ft.; Actual: 96 in.)
$4.58
Ideal to use for retaining walls, landscaping and walkways
Measures 8 ft. L x 3.875 in. W x 3.25 in. Th
For free in this instance means a lot of work & not knowing if below ground the posts are rotted. That and bringing top soil to backfill the holes.