Scanning the offseason depth chart — which can be as useful as sandpaper in the ocean — it looked as if the Giants needed to fill six holes in their lineup.

As NFL free agency heads into its second week, the Giants have addressed just one of those needs.

The signing of former Cowboy Dwayne Harris means the kick- and punt-return duties can be checked off, and perhaps he also can serve as the No. 4 receiver.

But, unless defensive coordinator Steve Spagnuolo is planning on using a very strange personnel grouping, the Giants still do not know the identity of their starting strong and free safety.

There also are first-unit spots to fill at weak side linebacker, defensive end and at least one space on the offensive line.

It is a fairly long shopping list, and thus far the Giants have been strolling up and down the aisles but their basket is nearly empty, and the choice items are getting plucked from the shelves.

The greatest concern is at safety. The only two viable options already on the roster, Nat Berhe entering his second season and oft-injured Cooper Taylor entering his third, never have started an NFL game and are no one’s idea of a starting safety tandem.

The Giants were serious about trying to sign Devin McCourty but they never were going to outbid the Patriots for the top safety to almost hit the market.

The other top safeties — Rahim Moore, Da’Norris Searcy, Tyvon Branch, Darian Stewart — found new homes. There was interest in Ron Parker but on Saturday he re-signed with the Chiefs.

Jeron Johnson (Seahawks in 2014) still is out there in what is an uninspiring group of leftovers.

So, it has been a slow start to free agency for the Giants, and it is clear their tip-toe into the pool has created far more ripple than splash.

What they’ve done

The Giants added what was a missing ingredient within the offense with Shane Vereen, one of the best pass-catching running backs in the league, a skill-set the Giants did not previously possess.

The special teams got a major jolt with the addition of former Cowboy Dwayne Harris, who will handle kickoff and punt returns and also will anchor coverage units as a gunner.

They have improved their non-existent depth at offensive tackle with Marshall Newhouse, a young veteran the Giants hope works out as better insurance than Charles Brown did last season. The re-signing of John Jerry — who started all 16 games last season at right guard — was surprising, given his sub-par run-blocking, unless he returns strictly as a reserve.

Two of their sometimes-starting, mostly reserve linebackers, Jacquian Williams and Spencer Paysinger, have been replaced with J.T. Thomas and Jonathan Casillas, players who should add some speed.

Two of their 2011 undrafted free agents were re-signed, linebacker Mark Herzlich and fullback Henry Hynoski, solid locker room guys, to once again fill specialty roles. The Giants also brought back cornerback Chykie Brown, who played well last season after he was let go by the Ravens and picked up in November.

What’s left to do