Try:
ldf <- list(df1 = data.frame(row=LETTERS[1:8],col=1:8), df1 = data.frame(row=LETTERS[1:7],col=1:7))
> ldf
$df1
row col
1 A 1
2 B 2
3 C 3
4 D 4
5 E 5
6 F 6
7 G 7
8 H 8
$df1
row col
1 A 1
2 B 2
3 C 3
4 D 4
5 E 5
6 F 6
7 G 7
> lapply(ldf, function(x) sum(LETTERS[1:8] %in% x$row)!=8)
$df1
[1] FALSE
$df1
[1] TRUE
BUILD
Can also use: names(ldf) <- c("file1.txt", "file2.txt")
$file1.txt
[1] FALSE
$file2.txt
[1] TRUE
UPDATE
A nicer way would be:
lapply(ldf, function(x) all(LETTERS[1:8] %in% x$row) & all(1:8 %in% x$col))
$file1.txt
[1] TRUE
$file2.txt
[1] FALSE